Loop aerial



Sept. 25, 1928. 1,685,652

, T. THRIFT LOOP AERIAL Filed May 25, 1925 I 9 d /5 n WT I uuenk qmw Patented Sept. 25, 1928. V

umrsn STATES g 1,685,652 PATENT OFFICE.

TIMOTHY THRIFT, or CLEVELAND, oHIo;

' LOOP AERIAL.

Application area may 23, 1925. Serial no. 32,472.

while requiring no greater length of wire i as the reason that they serve as tension in appearance.

The usual four-sided aerial has, of course, only four bends in each complete loop of wire while the type employing two cross arms and an upright staff has six bends, and in each case there are oppositely disposed parallel stretches'of wire. .I have found by employing radially disposed arms with successive arms of unequal length and by using the same amount of wire as used in the usual forms that I obtain better receptivity. The exact reason forthis is unknownt'o' me, but I believe it to be by reason of the increased number of bends 1n eachturn or loop of and which may be easily made,.and be neat wire and by reasonof the further fact that no directly opposite stretches of wire inmy construction are parallel.

Other objects and features of my invention will more fully appear in the following description and will be summarized in the claims.

In the drawings Fig.1 is a perspective view of my preferred form of loop aerial; Fig. 2 is a fragmentary sectional plan of my preferred form of retaining means for the wire supporting arms. Fig. 3 is a crosssection as indicated by the line 3-3 on Fig. 2. 7 'c i 1 Referring in detail to the drawings, 1 indicatcs the usual pedestal and 2 a stall member rising therefrom'which maybe braced by suitable web members The staff terminates in a. clamping member 5, which may be formed by inwardly facing channel plates 6 and 7 suitably clamped together as by means of a screw or bolt 4.. Vertically and horizontally disposed channels 8 and diagonally disposed channels 9 in each plate may serve to retain the loop supporting arms in position. I Seated in the channels 9 and preferably formed of two continuousover-lapping bars are diagonal arms 10 and 11 which may be made to occupy a single plane by cutting notches in each bar as shown in Fig. 3, one arm being lapped over the other. The cross members 10 and 11 are made continuous for The primary obj cct juncture as shownparticularly in Fig. 2, and need not be held against removal from the member 5 since, as Wlll hereinafter appear,

they serve as compression members.

Near the ends of the armslO to 14, I pro-- vide suitable cross arms or wire supporti'ng guides 15 which may be secured in" any manner iiislots 16 at the ends of the arm's.- A similar cross arm or guide 17 may extend hers, while the vertical arms 2, 12, 13 and 14 I simply abutthe cross arms 10 and 12 at their through the upright 2 assho'wn in Fig. 1Q

Each alternate guide, namely those ofthe vertical and horizontal arms, has outwardly disposed notches 18 for receiving the turns of wire XV, while the cross arms of the-diagonals have inwardly facing notches 19 as shown.

The wire W is wound in continuous coils on either side of the crossarm andis preferably wound in a counter-clockwise direc tion as shown beginning at a central binding post 20, the wire engaging first the inwardly facing notch 19, adjacent the supv porting arm of the first encountered guide member 15 as shown in Fig. 1 and then, the corresponding outwardly facing notch cf the guide on the member 14 and so on, the arrangement resulting in all of the vertical and horizontally disposed arms becoming com pression members to hold the coils in extended position, while the diagonally disposed arms become tension members to draw their respective stretches of wire inwardly. The completely wound coils on the side toward the observer in F ig. 1,.terminate in the upper binding'post 21, while the wire on the opposite side of the aerial extends from the central binding post first to the notch 19 and then into engagement with each cross :arni terminating finally at the binding post'22.

Any suitableelectrical connection may be made by the ends of the wires with the binding posts which I have shown as mounted upon a plate of insulating material 24, secured as by screws 25 to the upright 2. This loop aerial may serve as a complete series aerial in which case the binding post suits, in a loo'paerial in which the individual stretches of wire have eight different while by reason of pulling in the stretches of wire between the horizontal and vertical arms, no perpendicularly disposed stretches of wire are parallel. I am aware that changes may be made in my construct-ion such for instance, as using additional arms, providing adjustment for holding the wires taut, or using simply wires or light rods in place of the diagonal arms while keeping Within the scope of my invention, and I do not therefore wish to limit myself to the exact form shown.

I claim- 1. A loop aerial comprising in combina tion radially extending members, one of said members serving as a support for the aerial, cross arms carried thereby. retaining means for the members engaging the members at the point of radiation, two of said members being continuous and intersecting, the others abutting the continuous members at the point of intersection. and loops of wire engaging the cross arms. said loops engaging the arms of the continuous members on the side adjacent to said point of radiation and the arms of the others on the side remote from said point, whereby the loops maintain the abutting members within the retaining means.

2. A loop antenna comprising in combination a pair of members crossing each other and overlapping, cross arms secured at the ends of said members having spaced slots for receiving coils of wire, and members abutting the first named members at their intersection, provided with similar cross arms, and loops of wire engaging the slots and extending under the cross arms of the overlapping members and over the cross arms of the abutting members, the said overlapping l'IlGHilJGIS being shorter than the abutting members whereby there is a definite bend in each loop where it engages each cross arm.

3. A loop antenna comprising in combination outwardly extending members of different lengths lying in a common plane, the shorter of the members being joined. a slotted retaining plate engaging the members to hold them in extended position and a coil of wire engaging the joined members and tending to pull the shorter members outwardly, and engaging the longer members and tending to pull them inwardly, whereby the wire is given a bend at the point of engagement of each member.

In testimony whereof, I hereunto aflix my signature.

TIMOTHY THRIFT. 

